OP is posting on a public forum, one predominately aimed at parents and people trying to become parents. People are entitled to their opinions, and it's something I feel very strongly about. She can't just expect replies of: ah totally understandable Hun, your life definitely won't be fulfilled without your ickle wickle princess, Boys are smelly and girls are sooo much better.
Seriously, there are people on here and IRL who are desperately trying to have a child, people who have had several losses or traumatic pregnancies, or poorly babies. People need to appreciate the child for what it is, not what is between the baby's legs and again, something it NO control over. That poor baby doesn't deserve for its parents to be praying for it be a girl, it doesn't get any say on the matter.
Gender disappointment might be a 'thing' but that doesn't make it okay. And tell me: what about the baby being a boy or girl in particular possibly add to one's life to make it better?
Maybe I don't get it. But I don't want to. The idea of being disappointed in the baby's sex sickens me. Thankfully my son was 'okay' in the scheme of things compared to the other babies in SCBU but I saw the reality of babies being early or unwell, and it just doesn't matter whether a child is a girl or boy, only that the baby is okay.
It's things for the OP to consider.